Air register



FIG. 1 is a perspective top view of the air register showing my new design;

FIG. 2 is a left side elevation view thereof, the right side elevation view being a mirror image;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a front elevation view thereof, the rear elevation view being a mirror image. 

The ornamental design for an air register, as shown and described. 